 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.misc;

 import java.io.File ;
 import java.io.IOException ;
 import java.net.URL ;

 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.swt.program.Program;
 import org.eclipse.ui.internal.WorkbenchMessages;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.registry.EditorDescriptor;
 import org.osgi.framework.Bundle;

 public class ExternalEditor {
     private IPath filePath;

     private EditorDescriptor descriptor;

     /**
      * Create an external editor.
      */
     public ExternalEditor(IPath newFilePath, EditorDescriptor editorDescriptor) {
         this.filePath = newFilePath;
         this.descriptor = editorDescriptor;
     }

     /**
      * open the editor. If the descriptor has a program then use it - otherwise build its
      * info from the descriptor.
      * @exception Throws a CoreException if the external editor could not be opened.
      */
     public void open() throws CoreException {

         Program program = this.descriptor.getProgram();
         if (program == null) {
             openWithUserDefinedProgram();
         } else {
             String path = ""; //$NON-NLS-1$
 if (filePath != null) {
                 path = filePath.toOSString();
                 if (program.execute(path)) {
                     return;
                 }
             }
             throw new CoreException(
                     new Status(
                             IStatus.ERROR,
                             WorkbenchPlugin.PI_WORKBENCH,
                             0,
                             NLS.bind(WorkbenchMessages.ExternalEditor_errorMessage, path),
                             null));
         }
     }

     /**
      * open the editor.
      * @exception Throws a CoreException if the external editor could not be opened.
      */
     public void openWithUserDefinedProgram() throws CoreException {
         // We need to determine if the command refers to a program in the plugin
 // install directory. Otherwise we assume the program is on the path.

         String programFileName = null;
         IConfigurationElement configurationElement = descriptor
                 .getConfigurationElement();

         // Check if we have a config element (if we don't it is an
 // external editor created on the resource associations page).
 if (configurationElement != null) {
             try {
                 Bundle bundle = Platform.getBundle(configurationElement
                         .getNamespace());
                 // See if the program file is in the plugin directory
 URL entry = bundle.getEntry(descriptor.getFileName());
                 if (entry != null) {
                     // this will bring the file local if the plugin is on a server
 URL localName = Platform.asLocalURL(entry);
                     File file = new File (localName.getFile());
                     //Check that it exists before we assert it is valid
 if (file.exists()) {
                         programFileName = file.getAbsolutePath();
                     }
                 }
             } catch (IOException e) {
                 // Program file is not in the plugin directory
 }
         }

         if (programFileName == null) {
             // Program file is not in the plugin directory therefore
 // assume it is on the path
 programFileName = descriptor.getFileName();
         }

         // Get the full path of the file to open
 if (filePath == null) {
             throw new CoreException(
                     new Status(
                             IStatus.ERROR,
                             WorkbenchPlugin.PI_WORKBENCH,
                             0,
                             NLS.bind(WorkbenchMessages.ExternalEditor_errorMessage,programFileName),
                             null));
         }
         String path = filePath.toOSString();

         // Open the file

         // ShellCommand was removed in response to PR 23888. If an exception was
 // thrown, it was not caught in time, and no feedback was given to user

         try {
             Runtime.getRuntime().exec(new String [] { programFileName, path });
         } catch (Exception e) {
             throw new CoreException(
                     new Status(
                             IStatus.ERROR,
                             WorkbenchPlugin.PI_WORKBENCH,
                             0,
                             NLS.bind(WorkbenchMessages.ExternalEditor_errorMessage,programFileName),
                             e));
         }
     }
 }

